5G NSA (EN-DC) KPI Calculator
Measure how well 5G NSA is working on the LTE anchor.
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5G NSA (EN-DC) KPI Calculator by TheCalcTools
How the 5G NSA (EN-DC) KPI Calculator works
Enter the SgNB addition and release counters from the anchor eNB or gNB.
Add the number of EN-DC capable UEs and those with active NR, plus data volumes.
The tool gives accessibility (SgNB addition), retainability (SCG drops) and utilisation.
The formula
Worked example
Using the default values shown in the calculator:
| SgNB addition attempts | 48000 |
|---|---|
| SgNB addition successes | 45600 |
| SgNB releases, total | 44800 |
| SgNB abnormal releases (SCG drops) | 1250 |
| UEs with EN-DC capability | 9200 |
| UEs with active NR (SCG) | 5100 |
| NR data volume (GB) | 3800 |
| Total data volume, LTE + NR (GB) | 9600 |
- SgNB addition SR = 45,600 ÷ 48,000 = 95.00% (failure 5.00%).
- SCG drop rate = 2.79%; 55.4% of EN-DC UEs use NR; NR carries 39.6% of traffic.
Result:
| SgNB addition success rate | 95.00% |
|---|---|
| SgNB addition failure rate | 5.00% |
| SCG drop rate | 2.79% |
| EN-DC UEs actually using NR | 55.4% |
| NR share of traffic | 39.6% |
Frequently asked questions
What is a typical SgNB addition success rate?
Many networks aim for above 95–98%. Lower values usually point to RACH failures on NR, X2 problems or resource limits at the gNB.
Why is NR usage low when many UEs are capable?
Coverage, B1 thresholds, SgNB addition failures and short sessions all reduce the time UEs spend with an NR leg.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.